Video cameras allow a person to capture the events that are going on in a room, or to watch a recording of events to identify the exact source and direction of a person’s actions. They are particularly useful for the following:
Interacting with other people in a group
Viewing things from afar
Interacting with police or other rescue personnel
Recording audio by recording the person’s voice, or by recording their voice as the person speaks
Getting information from witnesses and other people present in an event
Recording video from a camcorder or digital video camera
A digital video camera allows you to use video of another person or objects to identify them, and to get that person’s name and or telephone number. The video recording you make on a digital video camcorder will usually be stored on your computer for a period of time. If you need to return the video to your computer to see your recording, you may need to use the video recording software that came with the device or use another software program that enables the computer to record. (See “How video is recorded or transmitted.”)
Most digital cameras have built-in memory to hold enough images of a person or object to keep recording when one is activated. (When activated, a camera may automatically start recording and keep recording until power or battery power is lost.) Digital video cameras can be programmed to automatically start and stop recording. While you won’t need a manual mode, you should be careful not to press the record button on a camera to record, as that could activate it to record an image.
Note: When you are using a digital video camera, you cannot turn the camera on and off by pushing the power button or by using a remote control. You can only turn the camera on.
What is the difference between the CCD (Central Camera Digital) and the CMOS (Compact CMOS) digital cameras?
All digital video cameras use a CMOS (compact digital camera), and the majority of them use the CCD (Central Camera Digital) sensor. CMOS sensors have a larger resolution per unit area than is possible with a CMOS image sensor; for example, a CMOS camera would have a 20×19 lens but only a 12×12 sensor to photograph a 20×19 object. Because of their superior resolution and smaller area, CMOS cameras allow for higher image resolution and wider field-of-view (FOV) in photographs compared to CMOS sensors.
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